Due to the decentralized structure of the domain name system, it can take up to 48 hours for your custom name servers to take effect everywhere. The DNS records will then be deactivated.
Collections are analogous to tables in relational databases. If a collection does not exist, MongoDB creates the collection when you first store data for that collection.
You can go to https://www.katacoda.com/mysql-db-sandbox/scenarios/mysql-sandbox to access the MySQL Sandbox, which has the Sakila sample database loaded in a MySQL instance. You’ll have to set up a (free) Katacoda account. Then, click the Start Scenario button. See also: https://dev.mysql.com/doc/index-other.html
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